TK11850LTL TOKO [TOKO, Inc], TK11850LTL Datasheet - Page 8

• Manufacturer Part Number: TK11850LTL
• Description: WHITE LED DRIVER
• Manufacturer: TOKO [TOKO, Inc]

TK11850L
Page 8
V
N I
2
2
3
3
4
6
5 .
7 .
0 .
5 .
5 .
0 .
(
100
•
•
•
) V
60
40
20
80
0
0
Input Voltage: 2.7 V
LED Current: 20 mA
On/Off: Pin Number 8 (EN Pin)
LED Current (I
I
is controlled by the feedback circuit.
LED
doesn’t depend on V
LED Current and Efficiency Characteristics
I
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
N I
1
1
9
5
4
7
2
1
0
(
5
9
2
9
m
5
6
EF LED vs. V IN
4 .
2 .
9 .
1 .
9 .
9 .
) A
V IN (V)
4
LED
APPLICATION CIRCUIT (3 LEDs in Series)
) is set by R
V
1
1
1
1
1
1
L
E
0
0
0
0
0
0
D
3 .
3 .
3 .
3 .
3 .
3 .
6
(
) V
8
8
8
8
9
9
IN
because I
T
LED
8
A
= 25 °C, unless otherwise specified.
.
I
L
E
1
1
1
1
1
1
D
9
9
9
9
9
9
(
4 .
5 .
5 .
5 .
6 .
4 .
LED
m
9
2
2
6
0
1
) A
GND
V IN
4.7 F
C IN
E
SB07-03C
SANYO
F
6
7
7
7
7
7
L
9
0
0
3
6
9
E
5 .
0 .
8 .
1 .
2 .
0 .
0.27
L 22 uH
D
D31FU
R SC
TOKO
C OUT
2.2 uF
2
9
3
9
6
4
(
V OUT
%
EXT
V IN
I S
)
0.1 V
10
20
16
14
12
18
+
-
I S COMP
0
L: D31FU, 22 mH
Toko Part Number: 888FU-220M
EF LED (%) = 100 * V
2
Q
I LED vs. V IN
V LED
R
S
Cx
CLK
0.86 V
V IN (V)
0.3 V
4
OSC
BAND GAP REFERENCE
I LED
May 2001 TOKO, Inc.
CLK
0.525 V
LED
V REF
ERROR
COMP
6
+
-
* I
LED
7
8
EN
GND
V FB
C X
8
/ V
IN
ON/OFF
R LED
27
* I
82 pF
C X
IN